|Publication number||US6256127 B1|
|Application number||US 09/519,828|
|Publication date||Jul 3, 2001|
|Filing date||Mar 6, 2000|
|Priority date||May 29, 1997|
|Also published as||CA2291610A1, DE69831941D1, DE69831941T2, EP0981869A1, EP0981869B1, US6101011, WO1998054854A1|
|Publication number||09519828, 519828, US 6256127 B1, US 6256127B1, US-B1-6256127, US6256127 B1, US6256127B1|
|Inventors||Michael G. Taylor|
|Original Assignee||Ciena Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (15), Non-Patent Citations (3), Referenced by (78), Classifications (7), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. patent application Ser. No. 08/862,930 filed May 29, 1997.
The invention relates to optical transponders generally and, more particularly, to optical transponders which change the modulation format of incident optical signals.
Optical communication systems are a substantial constituent of communication networks. The expression “optical communication system,” as used herein, relates to any system which uses optical signals to convey information across an optical waveguiding medium. Such optical systems include, but are not limited to, telecommunications systems, cable television systems, and local area networks (LANs). Optical systems are described in Gowar, Ed. Optical Communication Systems, (Prentice Hall, N.Y.) c. 1993, the disclosure of which is incorporated herein by reference.
Optical transmitters are typically available in a particular modulation format. Depending upon the transmission medium for a given optical system, it may be desirable to use a specific modulation format to enhance the transmission characteristics of the launched optical signal.
In some optical systems wavelength division multiplexing (WDM) is employed to increase the capacity of the fiber optic network. In a WDM system, plural optical channels are carried over a single waveguide, each channel being assigned a particular wavelength. To provide compatibility of the WDM format with existing networks, it is desirable to convert a signal from a received transmission wavelength to a specific channel wavelength within the WDM system. In assignee's prior patent and patent application, U.S. Pat. No. 5,504,609 and Ser. No. 08/624,269, the disclosures of which are incorporated herein by reference, a series of optical remodulators are used to take input signals from various optical transmitters and output the information onto optical channels within the channel plan of a WDM optical system. Typically, the modulation formats of the optical signals output by the optical transmitters and the remodulators is the same. However, depending upon the type of optical receivers employed and the transmission characteristics of the optical system, it may be desirable to change the modulation format of the optical transmitters to a format which is better suited to transmission in the WDM optical system.
Thus, there is a need in the art for optical transponders which can change the modulation format of incident optical signals. There is a further need in the art for improved WDM optical communication systems which can receive incoming optical transmitter signals of various modulation formats and place the information onto WDM system optical channels in a different modulation format from that of the transmitter optical signals.
The present invention provides a modulation format adjusting optical transponder for receiving an incident optical signal of a first modulation format and outputting an optical signal having a different modulation format. The transponder includes an optical-to-electrical conversion element configured to receive an information-bearing optical signal having a first modulation format and output an electrical signal corresponding to information from the incident optical signal. The transponder includes a laser for outputting an optical carrier signal at a selected wavelength and a modulator communicating with the optical-to-electrical conversion element and with the laser. The modulator places the information from the incident optical signal onto the optical signal output by the laser, creating a modulated optical output signal having a second modulation format different from the first modulation format. Advantageously, the optical transponders of the present invention can take optical signals in a common modulation format, such as amplitude modulation, and output optical signals in a power-flat modulation format, such as frequency shift key (FSK) modulation. The modulation format adjusting optical transponders of the present invention can be used as remodulators for wavelength division multiplexed optical systems.
FIG. 1 schematically depicts a modulation format adjusting optical transponder according to the present invention.
FIG. 2 schematically depicts a wavelength division multiplexed optical communication system employing the optical transponder of FIG. 1 as an optical remodulator.
Turning to the drawings in detail, FIG. 1 schematically depicts a modulation format adjusting optical transponder 30 according to the present invention. Transponder 30 receives an optical signal output by an optical transmitter. The input optical signal is converted by optoelectronic converter 32, typically a photodiode, to an electrical signal.
The resultant electrical signal is amplified by amplifier 34, and routed through clock and data recovery circuit 35. Following retiming, the electrical signal passes to modulator driver 39 which drives modulator 38. (It is noted that while modulator 38 is an external modulator such as a Mach-Zehnder modulator, other techniques for modulating the optical signal including electroabsorption modulators and direct modulation can be used in the present invention.)
Transponder 30 includes an optical source, such as laser 36, for delivering a non-information-bearing optical carrier signal to the laser output waveguide. In an exemplary embodiment, laser 36 is a DFB semiconductor diode laser, generally comprising one or more III-V semiconductor materials, commercially available from a wide variety of suppliers such as Fujitsu, GEC Marconi, and Hewlett-Packard. The laser outputs an optical carrier signal at a particular optical wavelength, λ1, (which, in the case of a WDM optical system, is a wavelength corresponding to a demultiplexer wavelength included in a receiving system). Laser driver 37 provides the required laser bias current through a suitable power supply (not shown) as well as thermal control of the laser wavelength.
An optical wave in a single mode fiber of a certain center frequency has three parameters which can continuously vary with time: amplitude, phase (frequency), and state of polarization. What is meant by “modulation format” is that one of these attributes, or a coupled combination of these, is made to vary in accordance with the information being imparted to that optical wave. The other parameters are not constrained to follow the information signal. Two modulation formats are different if the coupled combination of optical wave parameters (which can refer to a single parameter being varied) are substantially different. Modulator 38 uses a modulation format different from the modulation format of the optical signal input to optoelectronic converter 32. Typically, the incident optical signals are amplitude modulated. Advantageously, transponders 30 can employ modulators with power flat modulation formats such as frequency shift key (FSK) or polarization shift key (PolSK) to create optical signals which do not create time-dependent power variations within the optical system. A particularly preferred modulation format creates a non-zero chirped optical signal, a modulation format which varies both the amplitude and phase of the optical signal. Using the modulation format adjusting optical transponders, incident amplitude-modulated optical signals from optical transmitters can be converted to optical signals with a power-flat modulation format. However, it is understood that the invention encompasses any transponder which uses a modulator having a modulation format, whether amplitude, frequency, phase, or polarization based (or a combination thereof), which is different from the modulation format of the incident optical signal. Various modulation formats are described in further detail in the Gowar reference, cited above, and in Schwartz, Information, Transmission, Modulation, and Noise, (McGraw-Hill, N.Y.), c. 1990, the disclosure of which is incorporated by reference herein.
FIG. 2 depicts a wavelength division multiplexed optical communication system 10 employing the modulation format adjusting transponders of FIG. 1 as optical remodulators. Optical communication system 10 takes optical transmission signals from diverse optical transmitters and other optical signal sources and maps the signal sources onto a wavelength division optical communication system, i.e., a communication system in which individual optical signals correspond to optical channels within a wavelength division multiplexed optical signal carried on an optical waveguide.
In the exemplary embodiment of FIG. 2, optical transmitters 20 are used to provide the information that will be carried by the optical channels within the WDM optical system. Optical transmitters 20 generally includes a laser, such as a DFB semiconductor laser, and a modulator for creation of an information-bearing optical signal. The expression “information-bearing optical signal,” as used herein, refers to an optical signal which has been coded with information, including, but not limited to, audio signals, video signals, and computer data, generally through modulation. Alternatively, particularly for short-reach optical transmitters, the laser of optical transmitter 10 can be directly modulated. Because some of the transmitters may form part of an existing optical system, a wide variety of transmitters emitting in a broad range of wavelengths can be accommodated in the optical communication system of the present invention, thus ensuring compatibility with currently-deployed transmission equipment. Typical transmitters emit wavelengths ranging from about 1300 to 1600 nm. Transmitters in current optical communication systems and various optical modulation techniques employed therein are described in Gowar, Optical Communication Systems, incorporated by reference above. Optical transmitters suitable for use in the present invention are commercially available from NEC, Fujitsu, Alcatel, and Nortel.
Optical communication system 10 uses the modulation format adjusting transponders 30 of FIG. 1 as remodulators 130 for receiving the transmitted information-bearing optical signal and outputting an information-bearing optical signal at a WDM optical system channel wavelength λj. The subscript j ranges from 1 to 16 for the exemplary optical system of FIG. 1 but can also be, for example, 4, 8, or 32 depending upon the capacity needs of the optical route services by the system. Typically, the wavelengths emitted by the remodulators are selected to be within the 1500 nanometer range, the range in which the minimum signal attenuation occurs for silica-based fibers. More particularly, the wavelengths emitted by the remodulators are selected to be in the range from 1530 to 1560 nanometers. However, other wavelength bands may be selected according to overall system requirements.
Each optical channel is routed to optical combiner 50 for conveyance to optical waveguide 60. Optical combiner 50 is selected from any passive optical component which can combine plural wavelengths into a single output medium. Frequently, optical splitters used to divide a signal among plural outputs are used as optical combiners, operated in reverse fashion from the splitter. Exemplary optical combiners include 1ŚN passive splitters available from Corning, Inc., Corning, N.Y., 1ŚN wideband single mode splitters available from IOT Integrierte Optik GmbH, Waghausel-Kirrlach, Germany, and fused fiber combiners available from Gould, Inc., Millersville, Md. The combination of channels forms a multiplexed optical signal which is output to waveguide 60. Optical waveguide 60 is typically a single-mode optical fiber such as SMF-28, available from Corning, and TRUEWAVE, available from AT&T Corp./Lucent Technologies, and is the principal transmission medium for the optical communication system. However, any optical waveguide which is capable of transporting multiple optical wavelengths can be employed as waveguide 60 in optical system 10.
Optionally interposed along optical waveguide 60 are one or more optical amplifiers 70. Optical amplifiers 70 are selected from any device which directly increases the strength of plural optical signals without the need for optical-to-electrical conversion. In general, optical amplifiers 70 are selected from optical waveguides doped with rare earth ions such as erbium, neodymium, praseodymium, ytterbium, or mixtures thereof. Optical amplifiers, their materials , and their operation are further described in Gowar, Ed. Optical Communication Systems, incorporated by reference above and in Desurvire, Erbium-Doped Fiber Amplifiers, (John Wiley & Sons, Inc., N.Y.), c. 1994, and Bjarklev, Optical Fiber Amplifiers: Design and System Applications, (Artech House, Norwood, Mass.) c. 1993 the disclosures of which are incorporated by reference herein. An exemplary optical amplifier configuration is disclosed in U.S. patent application Ser. No. 08/554,976, the disclosure of which is incorporated by reference herein. Alternatively, other optical amplifiers, such as semiconductor optical amplifiers, may be used along transmission line 60.
Following transmission and amplification of the multiplexed optical signals along waveguide 60, each channel must be demultiplexed and routed to the receiver designated for the particular λj, channel. The multiplexed signal is input to optical splitter 80 which places a portion of the multiplexed signal onto plural output paths 82. Each output path 82 optically communicates with a receiving system 90. Optical splitter 80 is selected from any optical device which can divide an input optical signal and place it onto plural output paths. Exemplary splitters include passive optical components such as those components described for use as optical combiner 50. Receiving systems 90 typically include wavelength selectors (not shown) for selecting the particular channel, λj, from the multiplexed signal and a receiver (not shown). Exemplary receiving systems are described in U.S. Pat. No. 5,504,609 incorporated by reference above.
While the foregoing invention has been described in terms of the embodiments discussed above, numerous variations are possible. Accordingly, modifications and changes such as those suggested above, but not limited thereto, are considered to be within the scope of following claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4584720 *||Aug 30, 1983||Apr 22, 1986||British Telecommunications||Optical communication system using pulse position modulation|
|US5483372 *||Nov 29, 1994||Jan 9, 1996||International Business Machines Corporation||Single and multichannel transmission over long distances using repeated level-crossing remodulation|
|US5504609 *||May 11, 1995||Apr 2, 1996||Ciena Corporation||WDM optical communication system with remodulators|
|US5541755 *||Sep 30, 1994||Jul 30, 1996||Siemens Aktiengesellschaft||Method for readjusting a phase or frequency modulation shift of an optical transmission signal|
|US5559624||Nov 3, 1994||Sep 24, 1996||Lucent Technologies Inc.||Communication system based on remote interrogation of terminal equipment|
|US5594384 *||Jul 13, 1995||Jan 14, 1997||Gnuco Technology Corporation||Enhanced peak detector|
|US5594577 *||Jun 21, 1995||Jan 14, 1997||Canon Kabushiki Kaisha||Optical receiver and optical transmission system using the receiver|
|US5625327 *||Jul 13, 1995||Apr 29, 1997||Gnuco Technology Corporation||Modified Colpitts oscillator for driving an antenna coil and generating a clock signal|
|US5726784 *||Mar 29, 1996||Mar 10, 1998||Ciena Corp.||WDM optical communication system with remodulators and diverse optical transmitters|
|US5784184 *||Jun 24, 1996||Jul 21, 1998||Ciena Corporation||WDM Optical communication systems with remodulators and remodulating channel selectors|
|US5960040 *||Dec 5, 1996||Sep 28, 1999||Raytheon Company||Communication signal processors and methods|
|US6101011 *||May 29, 1997||Aug 8, 2000||Ciena Corporation||Modulation format adjusting optical transponders|
|EP0042229A1||May 29, 1981||Dec 23, 1981||The Post Office||Digital transmission systems|
|EP0477699A2||Sep 13, 1991||Apr 1, 1992||Fujitsu Limited||Optical communication system|
|GB2254746A||Title not available|
|1||Copy of PCT-International Search Report and Notification of Transmittal of the International Search Report or the Declaration, mailed Oct. 30, 1998 (7 pages total).|
|2||Copy of PCT—International Search Report and Notification of Transmittal of the International Search Report or the Declaration, mailed Oct. 30, 1998 (7 pages total).|
|3||Kikushima, et al., "Super-Wide-Band Optical FM Modulation Scheme and Its Application to Multichannel AM Video Transmission Systems" IEEE Photonics Technology Letters, vol. 8, No. 6, Jun. 1996, pp. 839-841.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7031612 *||Jul 17, 2001||Apr 18, 2006||Multiplex, Inc.||Optical transponders and transceivers|
|US7099382||Jul 28, 2003||Aug 29, 2006||Finisar Corporation||Integrated circuit with dual eye openers|
|US7149430||Jul 8, 2003||Dec 12, 2006||Finsiar Corporation||Optoelectronic transceiver having dual access to onboard diagnostics|
|US7162160||Mar 9, 2005||Jan 9, 2007||Finisar Corporation||System and method for protecting eye safety during operation of a fiber optic transceiver|
|US7184668||Sep 4, 2003||Feb 27, 2007||Finisar Corporation||System and method for protecting eye safety during operation of a fiber optic transceiver|
|US7200337||Aug 2, 2006||Apr 3, 2007||Finisar Corporation||Optoelectronic transceiver having dual access to onboard diagnostics|
|US7230961||Feb 10, 2005||Jun 12, 2007||Finisar Corporation||Temperature and jitter compensation controller circuit and method for fiber optics device|
|US7277648||Apr 15, 2004||Oct 2, 2007||Alcatel||Network element for use in an optical communication network, in particular a DWDM communication network|
|US7302186||Apr 22, 2004||Nov 27, 2007||Finisar Corporation||Optical transceiver and host adapter with memory mapped monitoring circuitry|
|US7317743||Oct 28, 2003||Jan 8, 2008||Finisar Corporation||Temperature and jitter compensation controller circuit and method for fiber optics device|
|US7332234||Sep 21, 2005||Feb 19, 2008||Finisar Corporation||Optoelectronic device capable of participating in in-band traffic|
|US7346278||Apr 2, 2004||Mar 18, 2008||Finisar Corporation||Analog to digital signal conditioning in optoelectronic transceivers|
|US7373090 *||Mar 26, 2004||May 13, 2008||Intel Corporation||Modulator driver circuit with selectable on-chip termination|
|US7386020||Dec 22, 2004||Jun 10, 2008||Finisar Corporation||Systems, devices and methods for temperature-based control of laser performance|
|US7426586||Oct 21, 2004||Sep 16, 2008||Finisar Corporation||Configurable input/output terminals|
|US7433371 *||Jan 24, 2005||Oct 7, 2008||Hitachi Communication Technologies, Ltd.||Optical cross connect apparatus and network|
|US7437079||Oct 30, 2003||Oct 14, 2008||Finisar Corporation||Automatic selection of data rate for optoelectronic devices|
|US7447438||Apr 29, 2005||Nov 4, 2008||Finisar Corporation||Calibration of digital diagnostics information in an optical transceiver prior to reporting to host|
|US7477847||Jul 25, 2003||Jan 13, 2009||Finisar Corporation||Optical and electrical channel feedback in optical transceiver module|
|US7486894||Apr 17, 2003||Feb 3, 2009||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers|
|US7502564||Feb 27, 2007||Mar 10, 2009||Finisar Corporation||Integrated memory mapped controller circuit for fiber optics transceiver|
|US7532820||Mar 17, 2005||May 12, 2009||Finisar Corporation||Systems and methods for providing diagnostic information using EDC transceivers|
|US7561855||Apr 29, 2005||Jul 14, 2009||Finisar Corporation||Transceiver module and integrated circuit with clock and data recovery clock diplexing|
|US7567758||Jul 28, 2003||Jul 28, 2009||Finisar Corporation||Transceiver module and integrated circuit with multi-rate eye openers and bypass|
|US7613393||Jul 28, 2003||Nov 3, 2009||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers and integrated loopback and bit error rate testing|
|US7630631||Apr 14, 2004||Dec 8, 2009||Finisar Corporation||Out-of-band data communication between network transceivers|
|US7664401||Jul 3, 2004||Feb 16, 2010||Finisar Corporation||Apparatus, system and methods for modifying operating characteristics of optoelectronic devices|
|US7756045||Sep 18, 2008||Jul 13, 2010||Hitachi, Ltd.||Optical cross connect apparatus and network|
|US7792425||Mar 2, 2005||Sep 7, 2010||Finisar Corporation||Network data transmission and diagnostic methods using out-of-band data|
|US7809275||Mar 7, 2005||Oct 5, 2010||Finisar Corporation||XFP transceiver with 8.5G CDR bypass|
|US7835648||Oct 13, 2008||Nov 16, 2010||Finisar Corporation||Automatic selection of data rate for optoelectronic devices|
|US7995927||Nov 2, 2009||Aug 9, 2011||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers|
|US8086100||Mar 9, 2009||Dec 27, 2011||Finisar Corporation||Optoelectronic transceiver with digital diagnostics|
|US8159956||Jul 1, 2008||Apr 17, 2012||Finisar Corporation||Diagnostics for serial communication busses|
|US8406142||Apr 17, 2012||Mar 26, 2013||Finisar Corporation||Diagnostics for a serial communications device|
|US8515284||Dec 23, 2011||Aug 20, 2013||Finisar Corporation||Optoelectronic transceiver with multiple flag values for a respective operating condition|
|US8639122||Apr 26, 2005||Jan 28, 2014||Finisar Corporation||Filtering digital diagnostics information in an optical transceiver prior to reporting to host|
|US8849123||Jul 22, 2013||Sep 30, 2014||Finisar Corporation||Method of monitoring an optoelectronic transceiver with multiple flag values for a respective operating condition|
|US9184850||Sep 24, 2014||Nov 10, 2015||Finisar Corporation||Method of monitoring an optoelectronic transceiver with multiple flag values for a respective operating condition|
|US9577759||Nov 9, 2015||Feb 21, 2017||Finisar Corporation||Method of monitoring an optoelectronic transceiver with multiple flag values for a respective operating condition|
|US20020060824 *||Jul 17, 2001||May 23, 2002||Kang-Yih Liou||Optical transponders and transceivers|
|US20040022543 *||Jul 8, 2003||Feb 5, 2004||Hosking Stephen G.||Optoelectronic transceiver having dual access to onboard diagnostics|
|US20040047635 *||Sep 4, 2003||Mar 11, 2004||Finisar Corporation||System and method for protecting eye safety during operation of a fiber optic transceiver|
|US20040071389 *||Jul 25, 2003||Apr 15, 2004||Hofmeister Rudolf J.||Optical and electrical channel feedback in optical transceiver module|
|US20040076113 *||Jul 28, 2003||Apr 22, 2004||Aronson Lewis B.||Transceiver module and integrated circuit with multi-rate eye openers and bypass|
|US20040076119 *||Jul 28, 2003||Apr 22, 2004||Aronson Lewis B.||Transceiver module and integrated circuit with dual eye openers and integrated loopback and bit error rate testing|
|US20040091005 *||Oct 28, 2003||May 13, 2004||Hofmeister Ruldolf J.||Temperature and jitter compensation controller circuit and method for fiber optics device|
|US20040091028 *||Jul 28, 2003||May 13, 2004||Aronson Lewis B.||Transceiver module and integrated circuit with dual eye openers and equalizer|
|US20040190222 *||Apr 2, 2004||Sep 30, 2004||Roberts Martin Ceredig||Methods of forming capacitors, and methods of forming DRAM circuitry|
|US20040190223 *||Apr 2, 2004||Sep 30, 2004||Roberts Martin Ceredig||Dynamic random access memory (DRAM) circuitry|
|US20040197101 *||Apr 8, 2004||Oct 7, 2004||Sasser Gary D.||Optical transceiver module with host accessible on-board diagnostics|
|US20040223766 *||Apr 15, 2004||Nov 11, 2004||Alcatel||Network element for use in an optical communication network, in particular a DWDM communication network|
|US20050031352 *||Apr 22, 2004||Feb 10, 2005||Light Greta L.||Optical transceiver and host adapter with memory mapped monitoring circuitry|
|US20050058455 *||Apr 2, 2004||Mar 17, 2005||Aronson Lewis B.||Analog to digital signal conditioning in optoelectronic transceivers|
|US20050111501 *||Dec 22, 2004||May 26, 2005||Yew-Tai Chieng||Systems, devices and methods for temperature-based control of laser performance|
|US20050111845 *||Jul 3, 2004||May 26, 2005||Stephen Nelson||Apparatus, system and methods for modifying operating characteristics of optoelectronic devices|
|US20050127402 *||Oct 21, 2004||Jun 16, 2005||Dybsetter Gerald L.||Configurable input/output terminals|
|US20050169168 *||Jul 28, 2003||Aug 4, 2005||Aronson Lewis B.||Integrated circuit with dual eye openers|
|US20050169585 *||Mar 7, 2005||Aug 4, 2005||Aronson Lewis B.||XFP transceiver with 8.5G CDR bypass|
|US20050169636 *||Mar 9, 2005||Aug 4, 2005||Finisar Corporation||System and method for protecting eye safety during operation of a fiber optic transceiver|
|US20050185958 *||Jan 24, 2005||Aug 25, 2005||Hitachi Communication Technologies, Inc.||Optical cross connect apparatus and network|
|US20050213993 *||Mar 26, 2004||Sep 29, 2005||Mehdi Kazemi-Nia||Modulator driver circuit with selectable on-chip termination|
|US20050232635 *||Mar 2, 2005||Oct 20, 2005||Finisar Corporation||Network data transmission and diagnostic methods using out-of-band data|
|US20050232643 *||Apr 14, 2004||Oct 20, 2005||Lew Aronson||Out-of-band data communication between network transceivers|
|US20050281193 *||Apr 29, 2005||Dec 22, 2005||Hofmeister Rudolf J||Transceiver module and integrated circuit with clock and data recovery clock diplexing|
|US20060002711 *||Apr 26, 2005||Jan 5, 2006||Finisar Corporation||Filtering digital diagnostics information in an optical transceiver prior to reporting to host|
|US20060002712 *||Apr 29, 2005||Jan 5, 2006||Finisar Corporation||Calibration of digital diagnostics information in an optical transceiver prior to reporting to host|
|US20060263092 *||Aug 2, 2006||Nov 23, 2006||Hosking Stephen G||Optoelectronic Transceiver Having Dual Access to Onboard Diagnostics|
|US20070031153 *||Apr 17, 2003||Feb 8, 2007||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers|
|US20070140690 *||Feb 27, 2007||Jun 21, 2007||Finisar Corporation||Integrated Memory Mapped Controller Circuit for Fiber Optics Transceiver|
|US20090022059 *||Sep 18, 2008||Jan 22, 2009||Hitachi Communication Technologies, Ltd.||Optical Cross Connect Apparatus and Network|
|US20090041475 *||Apr 15, 2008||Feb 12, 2009||Intel Corporation||Modulator driver circuit with selectable on-chip termination|
|US20090245813 *||Mar 30, 2009||Oct 1, 2009||Kitel Technologies Llc||Modulator driver with multi-channel active alignment|
|US20100111539 *||Nov 2, 2009||May 6, 2010||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers|
|CN1306742C *||Apr 29, 2004||Mar 21, 2007||阿尔卡特公司||Network element for use in an optical communication network|
|EP1475914A1 *||May 5, 2003||Nov 10, 2004||Alcatel Alsthom Compagnie Generale D'electricite||Network element for use in an optical communication network, in particular a DWDM communication network|
|WO2004002023A2 *||Jun 25, 2003||Dec 31, 2003||Finisar Corporation||Transceiver module and integrated circuit with dual eye openers|
|WO2004002023A3 *||Jun 25, 2003||Mar 25, 2004||Lewis B Aronson||Transceiver module and integrated circuit with dual eye openers|
|U.S. Classification||398/9, 375/279|
|International Classification||H04B10/29, H04J14/02|
|Cooperative Classification||H04J14/02, H04B10/29|
|Dec 17, 2004||AS||Assignment|
Owner name: CIENA CORPORATION, MARYLAND
Free format text: MERGER;ASSIGNOR:CIENA PROPERTIES;REEL/FRAME:016069/0435
Effective date: 20041029
|Dec 27, 2004||FPAY||Fee payment|
Year of fee payment: 4
|Dec 4, 2008||FPAY||Fee payment|
Year of fee payment: 8
|Dec 5, 2012||FPAY||Fee payment|
Year of fee payment: 12
|Jul 15, 2014||AS||Assignment|
Owner name: DEUTSCHE BANK AG NEW YORK BRANCH, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNOR:CIENA CORPORATION;REEL/FRAME:033329/0417
Effective date: 20140715
|Jul 16, 2014||AS||Assignment|
Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, NO
Free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:CIENA CORPORATION;REEL/FRAME:033347/0260
Effective date: 20140715